They are not really my thing (not those above I love those...now I have to find the other two styles) but I would think that the style is reminiscent of blaxploitation film advertising in general...Coffy, Cleopatra Jones....
I'm not aware of any Blaxploitation poster that has that EXACT look, but as was mentioned earlier, it's in the style of Cleopatra Jones, Friday Foster, TNT Jackson etc.
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http://www.emovieposter.com/agallery/archiveitem/12501037.html
http://www.emovieposter.com/agallery/archiveitem/6166648.html
http://www.emovieposter.com/agallery/archiveitem/2288479.html
Here is a handy checklist to help tell eMoviePoster.com apart from all other major auctions!
http://museumofuncutfunk.com/curators-notes/
She has 700+ "blaxploitation" MPs:
https://youtu.be/MhNp3AIFDf8
Wowee!
What about John Kisch who has a phenomenal collection of African americans in cinema...silent cinema or something if I recall correctly.
http://www.separatecinema.com/